Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Nomeie o país que possui o iene.
 ###Tabelas: CREATE TABLE affiliates (affiliates_id AUTO_INCREMENT PRIMARY KEY, Calls VARCHAR, Frequency VARCHAR, Branding VARCHAR, Format VARCHAR, Timeslot VARCHAR, Group owner VARCHAR) CREATE TABLE most_appearances (most_appearances_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Total VARCHAR, League VARCHAR, Canadian Championship VARCHAR, CONCACAF Champions League VARCHAR) CREATE TABLE by_nationality (by_nationality_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Total INT, Champions INT, Current INT, First driver(s) VARCHAR, Last/current driver(s) VARCHAR) CREATE TABLE main_issuers (main_issuers_id AUTO_INCREMENT PRIMARY KEY, Currency VARCHAR, Country VARCHAR, Generic Name or Nickname VARCHAR, Rating ( S&P / Moodys ) VARCHAR, Negotiable debt at mid-2005 ( US dollar bn equivalent) INT, Government financial liabilities as % of GDP (end 2003 - source : OECD ) VARCHAR, Issuer VARCHAR, Internet site VARCHAR) CREATE TABLE ranking_round (ranking_round_id AUTO_INCREMENT PRIMARY KEY, Final Rank INT, Ranking Round Rank INT, Nation VARCHAR, Ranking Score INT, Round of 16 VARCHAR)  
SELECT Country FROM main_issuers WHERE Currency = Yen